/*
*   Copyright 2011 Matthew Crinklaw-Vogt
*
*   Licensed under the Apache License, Version 2.0 (the "License");
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*  limitations under the License.
*/

package com.tantaman.util.ref;

import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;

import com.tantaman.util.observer.ObserverSet;

public class ObservableWeakReference<T, IDENTIFIER_T> extends WeakReference<T>
	implements ObservableReference<IDENTIFIER_T>, ObservableReferenceProtectedMethods {
	private final IDENTIFIER_T mRegisteredIdentifier;
	private final ObserverSet<GCObserver<IDENTIFIER_T>> mObservers;
	
	public ObservableWeakReference(T arg0, ReferenceQueue<? super T> arg1, IDENTIFIER_T pIdentifier) {
		super(arg0, arg1);
		mRegisteredIdentifier = pIdentifier;
	}
	
	{
		mObservers = new ObserverSet<GCObserver<IDENTIFIER_T>>();
	}

	@Override
	public IDENTIFIER_T getRegisteredIdentifier() {
		return mRegisteredIdentifier;
	}

	@Override
	public void addObserver(GCObserver<IDENTIFIER_T> pObserver) {
		mObservers.addObserver(pObserver);
	}

	@Override
	public void removeObserver(GCObserver<IDENTIFIER_T> pObserver) {
		mObservers.removeObserver(pObserver);
	}
	
	@Override
	public void notifyObservers() {
		for (GCObserver<IDENTIFIER_T> obs : mObservers) {
			obs.objectCollected(mRegisteredIdentifier);
		}
	}
}
